Problems of the Week - December 7 to December 12

Rewards for Problems of the week:

5 points for the correct answer at your level; 10 points for the next level; 20 points each for 2+ levels up.

Lower Elementary:

Question: Ella plants a dozen seeds. Half of those seeds sprout and grow into plants. Each of those plants grows 3 flowers. How many flowers does Ella have?

Upper Elementary:

Question: A truck that weighs 4 tons when empty carries 1 ton of gravel. The driver unloads 500 pounds of gravel at a construction site. How many pounds do the truck and the gravel weigh in total now?

Middle School:

Question: Mason scores 40 points on his fifth of five quizzes, increasing his average score to 32 points. What was Mason’s average score after the first four quizzes?

Algebra and Up:

Question: Puppies sleep an average of 12 hours each day. Kittens sleep an average of 20 hours each day. If a puppy is 4 weeks older than a newborn kitten, then how old will the kitten be when the kitten and the puppy have gotten the same amount of sleep in total?

Challenge problem to take home. 20 points for the correct answer. 

In this circle puzzle, dashed arrows denote addition, while solid arrows denote multiplication. If all the circles must contain different positive integers, which number will replace the question mark?